涩老板在线免费视频_午夜成人精品_神马理论午夜,,_亚洲有薄码区久久欧美精品一区_97人人色_神马在线精品_成人熟女一区二区_亚洲二区三区四区_人妻午夜免费_大鸡巴猛男爆操骚逼国产一区二区_丁香婷婷久久一区二区三区_岛国内射美女_亚洲一级电影,亚洲欧美日韩国产最新版,亚洲五月综合缴情综合久久本,少妇色情喷水又紧又爽小说,巜上司的少妇的滋味,国产精品三级女人国产香蕉,亚洲最好的免费电影,欧美亚洲国产成人精品,国产永久一区二区三区,亚洲综合一区无码精品,歳の熟女セックス,内射带小孩熟妇,果冻传媒在线看免费视频观看,成人欧美一区二区三区片,亚洲 片内射欧美美妇,一本无码人妻在中文字幕免费,亚洲无毛视频,中文字幕丰满孑伦无码专区,亚洲爆乳无码专区色戒纶理,肉乳床欢无码片动漫软件,欧美日韩一区二区另类,久热只有精品在线直播,精品亚洲一区二区在线播放,精品国产乱码久久久久久影片,国产一级高清在线观看,国产精品福利在线一区,成人动漫下载,乱伦性爱视频,xo无码AV毛,国产黄A片免费网站免费,日韩欧美一级特黄特色大片

Ventilation duct is a municipal infrastructure to circulate air and reduce the concentration of harmful gases. The plates, profiles and other main finished materials used for the fabrication and installation of ventilation pipes and air ducts shall comply with the provisions of the current national standards for design and related products, and the factory inspection certificate shall be applied. The materials shall be accepted according to the current national standards when entering the site.

通風管道按材質分：一般有：鋼板風管(普通鋼板)、通風管道、不銹鋼通風管、玻璃鋼通風管、料通風管、復合材料通風管、彩鋼夾心保溫板通風管、雙面鋁箔保溫通風管、單面彩鋼保溫風管、涂膠布通風管(如礦用風筒)、礦用塑料通風管等。

Ventilation ducts are divided by material: generally, they are: steel plate air duct (ordinary steel plate), ventilation duct, stainless steel air duct, FRP air duct, material air duct, composite air duct, color steel sandwich insulation board air duct, double-sided aluminum foil insulation air duct, single-sided color steel insulation air duct, adhesive coated air duct (such as mine air duct), mine plastic air duct, etc.

預制好的風管，需要做好存放工作，以免受到二次污染。可將管口用塑料布等密封材料封住，然后將風管分門別類堆放好。使用管道前，請注意清洗作業，確認板材表面沒有腐蝕，干燥后不進行清掃。

The prefabricated air duct needs to be stored to avoid secondary pollution. The pipe orifice can be sealed with sealing materials such as plastic cloth, and then the air ducts can be stacked by categories. Before using the pipeline, please pay attention to the cleaning operation, confirm that the plate surface is free of corrosion, and do not clean it after drying.

1、施工前的準備工作

1. Preparation before construction

俗話說，“磨刀不誤砍柴”，充分的說明準備是保證風管安裝質量的前提。準備清潔管道的制作，無論采用工廠集中制作還是現場制作方式，都要保證場所的清潔和關閉，具有符合條件的采光和照明條件。另外，還要對制作好的方管進行看管，盡量避免污染。

As the saying goes, "sharpen your knife without mistaking firewood", it fully shows that preparation is the premise to ensure the installation quality of air duct. Prepare the fabrication of clean pipes, whether centralized fabrication in the factory or on-site fabrication, ensure that the site is clean and closed, and have qualified daylighting and lighting conditions. In addition, we should take care of the prepared square tube to avoid pollution as far as possible.

2、風管材質的選擇

2. Selection of duct material

選擇對管道的施工質量也有很大影響。一般來說，為了保證管道的重量，需要較小板厚的管道，但需要綜合考慮管道的尺寸和壓力水平。從設計角度來看，值得注意的是，一個系統可以同時具有對應于不同靜態壓力水平的幾個管道厚度。

The selection also has a great impact on the construction quality of the pipeline. Generally speaking, in order to ensure the weight of the pipeline, the pipeline with smaller plate thickness is required, but the size and pressure level of the pipeline need to be comprehensively considered. From a design point of view, it is worth noting that a system can have several pipe thicknesses corresponding to different static pressure levels at the same time.

3、風管的橫向連接

3. Transverse connection of air duct

風管的橫向連接有一定的應力。這種連接方法可以說是延長空氣導管長度的手段，并且還具有增強剛性和保持空氣導管橫向尺寸的功能通常，橫向連接方式是角鋼法蘭連接。這種連接模式取決于壁厚，也取決于連接類型和板墻加固模式。

The transverse connection of air duct has certain stress. This connection method can be said to be a means to extend the length of the air duct, and also has the function of enhancing the rigidity and maintaining the transverse size of the air duct. Generally, the transverse connection method is angle steel flange connection. This connection mode depends on the wall thickness, the connection type and the plate wall reinforcement mode.